CN111722450A - Method for generating intermediate infrared optical frequency comb - Google Patents
Method for generating intermediate infrared optical frequency comb Download PDFInfo
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- CN111722450A CN111722450A CN202010493692.3A CN202010493692A CN111722450A CN 111722450 A CN111722450 A CN 111722450A CN 202010493692 A CN202010493692 A CN 202010493692A CN 111722450 A CN111722450 A CN 111722450A
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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Abstract
The invention discloses a method for generating a mid-infrared optical frequency comb, which comprises the following steps: the method comprises the steps of taking a near-infrared optical frequency comb as a seed source, carrying out nonlinear power amplification on near-infrared laser pulses through a self-similar amplification module, broadening a spectrum through a self-phase modulation effect while amplifying the laser pulses, compressing the amplified laser pulses to obtain near-infrared laser pulses, focusing the near-infrared laser pulses on a mid-infrared difference frequency crystal in a difference frequency module, generating mid-infrared laser pulses through the difference frequency module, enabling carrier envelope phase frequency of the mid-infrared laser pulses to be passively stable, and enabling repetition frequency of the mid-infrared laser pulses to be locked along with repetition frequency of the seed source to obtain the mid-infrared optical frequency comb. The invention has the advantages that: the invention can obtain near-infrared laser pulse with wide spectrum, narrow pulse width, high power, low noise and near-zero chirp, and has simple light path structure and locking system.
Description
Technical Field
The invention belongs to the technical field of ultrafast optics, and particularly relates to a method for generating a mid-infrared optical frequency comb.
Background
Many molecular fundamental vibrations have strong absorption characteristics in the mid-infrared band, and the mid-infrared band optical frequency comb is an important research tool in spectroscopy, and has become a popular research direction in these years. At present, the technology of directly outputting mid-infrared femtosecond pulses from a laser is not mature, and more is based on a near-infrared optical comb, and the wavelength is expanded to mid-infrared by means of optical difference frequency. The requirement on the near-infrared optical comb is high, namely, a broad spectrum is needed to cover the wavelengths corresponding to the signal light and the pump light, and high nonlinearity is needed for meeting the requirement of difference frequency for high peak power. A commonly used method of broadening the spectrum is to shift the wavelength to the desired spectral range by self-phase modulation through highly nonlinear fibers or by generating raman solitons through negative dispersion fibers. In the difference frequency system with the structure, the signal light and the pump light need to be separated before the spectrum is widened in a high nonlinear way, then the spectrum of the signal light or the pump light is widened, and then the signal light or the pump light is overlapped in time and space and focused into a difference frequency crystal. In the middle infrared pulse light generation process, the influence of the environment on the broadening optical fiber can cause the signal light or the pump light to accumulate noise in the broadening process, so that the line width of the generated middle infrared comb teeth is widened. And the signal light and the pump light are overlapped in time and space, the delay and the collinearity of the signal light and the pump light need to be accurately controlled, and the optical path structure is complex and difficult to operate.
Disclosure of Invention
The invention aims to provide a method for generating an intermediate infrared optical frequency comb according to the defects of the prior art, the method takes the near infrared optical frequency comb as a seed source, then adopts a self-similar amplification mode to carry out nonlinear optical amplification on near infrared laser pulses, widens a spectrum by utilizing a self-phase modulation effect, and obtains the near infrared laser pulses after compression.
The purpose of the invention is realized by the following technical scheme:
a method of generating a mid-infrared optical frequency comb, the method comprising the steps of: the near-infrared optical frequency comb, the self-similarity amplification module and the difference frequency module are sequentially arranged; the method comprises the steps of taking the near-infrared optical frequency comb as a seed source, carrying out nonlinear power amplification on near-infrared laser pulses through the self-similar amplification module, broadening a spectrum through a self-phase modulation effect while amplifying the laser pulses, compressing the amplified laser pulses to obtain near-infrared laser pulses, focusing the near-infrared laser pulses on a mid-infrared difference frequency crystal in the difference frequency module, generating mid-infrared laser pulses through the difference frequency module, enabling carrier envelope phase frequency of the mid-infrared laser pulses to be passively stable, and enabling repetition frequency of the mid-infrared laser pulses to be locked along with repetition frequency of the seed source to obtain the mid-infrared optical frequency comb.
The near-infrared optical frequency comb is one of an optical frequency comb based on a solid laser, an optical frequency comb based on a fiber laser, an optical frequency comb based on a quantum cascade laser, an optical frequency comb based on single-frequency photoelectric light modulation and an optical frequency comb based on an optical microcavity.
The working wavelength of the near infrared optical frequency comb is within the near infrared light wavelength range.
The self-similar amplification module comprises a pre-amplification module, a pre-chirp management module, a main amplification module and a pulse compression module which are sequentially arranged, wherein the pre-amplification module comprises a first isolator, a first gain optical fiber, a wavelength division multiplexer and a first semiconductor laser which are sequentially arranged; the pre-chirp management module comprises a circulator, a chirp fiber grating and a fiber collimator; the main amplification module comprises a second isolator, a first lens, a second gain optical fiber, a second lens, a dichroic mirror and a second semiconductor laser which are sequentially arranged; the pulse compression module comprises a high-low mirror, a grating pair and a reflecting mirror which are arranged in sequence.
The pre-amplification module performs light amplification in a one-stage cascade light amplification mode or a multi-stage cascade light amplification mode.
The pre-chirp management module is one of a chirp fiber grating, a grating pair and a ridge grating pair.
The difference frequency module comprises a third lens, a mid-infrared difference frequency crystal, a fourth lens and an optical filter which are arranged in sequence.
The mid-infrared difference frequency crystal in the difference frequency module is one of periodically polarized lithium niobate, phosphorus germanium zinc crystal, selenium gallium silver crystal or selenium gallium lithium crystal.
The invention has the advantages that: (1) the invention can obtain near-infrared laser pulse with wide spectrum, narrow pulse width, high energy and near-zero chirp after self-similar amplification, signal light and pumping light are collinear and have no time delay, and the signal light and the pumping light can be directly focused on a nonlinear crystal to generate mid-infrared laser without widening spectrum or controlling the coincidence of the signal light and the pumping light in space and time, and the structure of a light path is simple. (2) The invention can obtain the mid-infrared optical comb with high average power, and the generated mid-infrared optical comb has low noise. (3) The invention is suitable for near-infrared optical combs with various optical wave bands. (4) The carrier envelope phase of the intermediate infrared laser generated by the invention is passively stable, and the repetition frequency of the intermediate infrared laser follows the repetition frequency of the near infrared optical comb, so that the repetition frequency of the near infrared optical comb only needs to be locked, and the locking system is simple.
Drawings
FIG. 1 is a schematic diagram of a method of producing a mid-infrared optical frequency comb of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a method for generating a mid-infrared optical frequency comb according to the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-2, the labels in the figure are: the near-infrared optical frequency comb 1, the self-similar amplification module 2, the difference frequency module 3, the pre-amplification module 21, the pre-chirp management module 22, the main amplification module 23, the pulse compression module 24, the third lens 31, the mid-infrared difference frequency crystal 32, the fourth lens 33, the optical filter 34, the first isolator 211, the first gain fiber 212, the wavelength division multiplexer 213, the first semiconductor laser 214, the circulator 221, the chirped fiber grating 222, the fiber collimator 223, the second isolator 231, the first lens 232, the second gain fiber 233, the second lens 234, the dichroic mirror 235, the second semiconductor laser 236, the high-low mirror 241, the grating pair 242, and the reflecting mirror 243.
Example (b): as shown in fig. 1-2, the present embodiment specifically relates to a method for generating a mid-infrared optical frequency comb, which mainly includes the following steps:
(1) the near-infrared optical frequency comb 1, the self-similar amplification module 2 and the difference frequency module 3 are sequentially arranged; wherein:
the near-infrared optical frequency comb 1 can be an optical frequency comb generated based on a solid laser, a semiconductor laser, a fiber laser, an optical microcavity or electro-optical modulation;
the self-similarity amplification module 2 comprises a pre-amplification module 21, a pre-chirp management module 22, a main amplification module 23 and a pulse compression module 24;
the pre-amplification module 21 comprises a first isolator 211, a first gain fiber 212, a wavelength division multiplexer 213 and a first semiconductor laser 214 which are arranged in sequence;
the pre-chirp management module 22 comprises a circulator 221, a chirped fiber grating 222 and a fiber collimator 223;
the main amplification module 23 includes a second isolator 231, a first lens 232, a second gain fiber 233, a second lens 234, a dichroic mirror 235, and a second semiconductor laser 236, which are sequentially arranged;
the pulse compression module 24 comprises a high-low mirror 241, a grating pair 242 and a reflecting mirror 243 which are arranged in sequence;
the difference frequency module 3 comprises a third lens 31, a mid-infrared difference frequency crystal 32, a fourth lens 33 and an optical filter 34 which are arranged in sequence.
(2) The method comprises the following steps that a near-infrared optical frequency comb 1 is used as a seed source, nonlinear power amplification is carried out on near-infrared laser pulses through a self-similarity amplification module 2, the spectrum is broadened through a self-phase modulation effect in the amplification process, and the amplified laser pulses are compressed to obtain the near-infrared laser pulses with wide spectrum, narrow pulse width, high energy and near-zero chirp;
specifically, the output power of the near-infrared optical frequency comb 1 with the repetition frequency locked is a laser pulse with a milliwatt level, and the laser pulse is amplified to hundreds of milliwatts through the pre-amplification module 21. The first semiconductor laser 214 provides pump light that is coupled into the first gain fiber 212 by the wavelength division multiplexer 213, and the first isolator 211 isolates the spontaneously radiated light in the first gain fiber 212 from affecting mode locking of the seed source. The large laser pulse is prevented from entering the pre-chirping management module 22, the circulator 221 and the chirped fiber grating 222 perform dispersion compensation on the laser pulse, the laser pulse is shaped to be approximately hyperbolic secant type in a time domain, a hyperbolic secant type pulse is obtained, the fiber collimator 223 outputs light to a spatial light path, the hyperbolic secant type pulse is coupled to a section of large-mode-field gain fiber, namely the second gain fiber 233 through the second isolator 231 and the first lens 232, pump light emitted by the second semiconductor laser 236 is coupled to the second gain fiber 233 through the second lens 234, and signal light is amplified.
(3) The spectrum range is wide enough to cover the wavelengths corresponding to the signal light and the pump light, the near-infrared laser pulse with high peak power is directly focused on the mid-infrared crystal, and the mid-infrared laser pulse can be generated through the difference frequency. Because the signal light and the pump light have the same carrier envelope phase frequency in the difference frequency process, the carrier envelope phase frequency of the generated intermediate infrared laser pulse is passively stable, and the repetition frequency of the intermediate infrared laser pulse is locked along with the repetition frequency of the seed source, so that an intermediate infrared optical frequency comb is generated;
specifically, the hyperbolic secant pulse keeps a pulse shape unchanged in a nonlinear amplification process, a spectrum is broadened towards two sides, a finally output spectrum can simultaneously cover wavelengths of signal light and pump light required by medium infrared, and the dichroic mirror 235 guides amplified high-power near-infrared laser pulses into the pulse compression module 24 to compensate dispersion. After the near-infrared laser pulses are reflected by the high-low mirror 241 to the grating pair 242 and the reflecting mirror 243, a near-infrared laser pulse sequence with a wide spectrum, a narrow pulse width, high energy and near-zero chirp can be output. The near-infrared laser pulse is focused into the mid-infrared difference frequency crystal 32 by the third lens 31, so that mid-infrared laser can be generated, the mid-infrared laser is collimated by the fourth lens 33 of the mid-infrared band, and the mid-infrared optical frequency comb with stable repetition frequency and carrier envelope phase can be obtained through the optical filter 34.
Claims (8)
1. A method of generating a mid-infrared optical frequency comb, the method comprising the steps of: the near-infrared optical frequency comb, the self-similarity amplification module and the difference frequency module are sequentially arranged; the method comprises the steps of taking the near-infrared optical frequency comb as a seed source, carrying out nonlinear power amplification on near-infrared laser pulses through the self-similar amplification module, broadening a spectrum through a self-phase modulation effect while amplifying the laser pulses, compressing the amplified laser pulses to obtain near-infrared laser pulses, focusing the near-infrared laser pulses on a mid-infrared difference frequency crystal in the difference frequency module, generating mid-infrared laser pulses through the difference frequency module, enabling carrier envelope phase frequency of the mid-infrared laser pulses to be passively stable, and enabling repetition frequency of the mid-infrared laser pulses to be locked along with repetition frequency of the seed source to obtain the mid-infrared optical frequency comb.
2. The method of claim 1, wherein said near-infrared optical frequency comb is one of a solid laser-based optical frequency comb, a fiber laser-based optical frequency comb, a quantum cascade laser-based optical frequency comb, a single-frequency electro-optic modulation-based optical frequency comb, and an optical microcavity-based optical frequency comb.
3. A method of generating a mid-infrared optical frequency comb as claimed in claim 1, wherein the operating wavelength of the mid-infrared optical frequency comb is in the near-infrared wavelength range.
4. The method for generating a mid-infrared optical frequency comb according to claim 1, wherein the self-similar amplification module includes a pre-amplification module, a pre-chirp management module, a main amplification module, and a pulse compression module, which are sequentially arranged, the pre-amplification module includes a first isolator, a first gain fiber, a wavelength division multiplexer, and a first semiconductor laser, which are sequentially arranged; the pre-chirp management module comprises a circulator, a chirp fiber grating and a fiber collimator; the main amplification module comprises a second isolator, a first lens, a second gain optical fiber, a second lens, a dichroic mirror and a second semiconductor laser which are sequentially arranged; the pulse compression module comprises a high-low mirror, a grating pair and a reflecting mirror which are arranged in sequence.
5. The method of claim 4, wherein the pre-amplification module performs optical amplification in a one-stage cascade optical amplification mode or a multi-stage cascade optical amplification mode.
6. The method of claim 4, wherein the pre-chirp management module is one of a chirped fiber grating, a grating pair, and a grating pair.
7. The method of claim 1, wherein the difference frequency module comprises a third lens, a mid-infrared difference frequency crystal, a fourth lens, and a filter, which are disposed in sequence.
8. The method of claim 1, wherein the mid-infrared difference frequency crystal in the difference frequency module is one of periodically poled lithium niobate, phosphorus germanium zinc crystal, selenium gallium silver crystal, or selenium gallium lithium crystal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113359368A (en) * | 2021-06-08 | 2021-09-07 | 杭州电子科技大学 | Optical frequency comb generation method and device based on signal modulation |
| CN113488833A (en) * | 2021-07-07 | 2021-10-08 | 北京交通大学 | Flat optical frequency comb generation device and method |
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| CN105490145A (en) * | 2016-01-07 | 2016-04-13 | 华东师范大学 | Tunable ultraviolet light generation apparatus based on self-similarity amplifier |
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2020
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| CN102879969A (en) * | 2012-09-27 | 2013-01-16 | 中国科学院物理研究所 | Optical frequency comb on basis of spectral shaping self difference frequency generation technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359368A (en) * | 2021-06-08 | 2021-09-07 | 杭州电子科技大学 | Optical frequency comb generation method and device based on signal modulation |
| CN113488833A (en) * | 2021-07-07 | 2021-10-08 | 北京交通大学 | Flat optical frequency comb generation device and method |
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